Reverted change 158c86910c36: do not link wiki as subrepo.
Causes more problems than it solves.
--- a/.hgsub Wed Dec 03 23:53:25 2014 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,1 +0,0 @@
-wiki = wiki
--- a/.hgsubstate Wed Dec 03 23:53:25 2014 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,1 +0,0 @@
-6257b3183440ba7bf5359f6204a3afa8ee4ce0c6 wiki
--- a/doc Wed Dec 03 23:53:25 2014 +0000
+++ /dev/null Thu Jan 01 00:00:00 1970 +0000
@@ -1,1 +0,0 @@
-wiki
\ No newline at end of file